Change Data Capture Developer Guide

Change Data Capture
Keep Your External Data Current with Change Data Capture
Subscribe to Change Events
Change Event Message Structure
Change Event Header Fields
Change Event Body Fields
Security Considerations
Change Event Considerations
Standard Object Notes
Sending Data Differences for Fields of Updated Records
Other Types of Change Events: Gap and Overflow Events
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Change Event Body Fields

The body of a change event message includes a list of fields and values for the corresponding Salesforce record. The fields that Salesforce includes in an event message depend on the operation performed.
Create
For a new record, the event message body includes all non-empty fields and system fields, such as the CreatedDate and OwnerId fields.
Update
For an updated record, the body includes only the changed fields. It includes empty fields only if they were updated to an empty value (null). It also includes the LastModifiedDate system field. The body includes the LastModifiedById field only if it has changed—if the user who modified the record is different than the previous user who saved it.
Delete
For a deleted record, the body doesn’t include any fields or system fields.
Undelete
For an undeleted record, the body includes all non-empty fields from the original record, in addition to system fields.